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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '10e42a820dbd5524f67d4bf3569808892313c13da0625b647ec21f58ad949832' 
  AND token = 'rmO0IEjRqSQKK2iIrGF43cUeKl5olAiFsqpHXhL8oYY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}